1// SPDX-License-Identifier: GPL-2.0
  2
  3#ifndef _DRM_MANAGED_H_
  4#define _DRM_MANAGED_H_
  5
  6#include <linux/gfp.h>
  7#include <linux/overflow.h>
  8#include <linux/types.h>
  9
 10struct drm_device;
 11
 12typedef void (*drmres_release_t)(struct drm_device *dev, void *res);
 13
 14/**
 15 * drmm_add_action - add a managed release action to a &drm_device
 16 * @dev: DRM device
 17 * @action: function which should be called when @dev is released
 18 * @data: opaque pointer, passed to @action
 19 *
 20 * This function adds the @release action with optional parameter @data to the
 21 * list of cleanup actions for @dev. The cleanup actions will be run in reverse
 22 * order in the final drm_dev_put() call for @dev.
 23 */
 24#define drmm_add_action(dev, action, data) \
 25	__drmm_add_action(dev, action, data, #action)
 26
 27int __must_check __drmm_add_action(struct drm_device *dev,
 28				   drmres_release_t action,
 29				   void *data, const char *name);
 30
 31/**
 32 * drmm_add_action_or_reset - add a managed release action to a &drm_device
 33 * @dev: DRM device
 34 * @action: function which should be called when @dev is released
 35 * @data: opaque pointer, passed to @action
 36 *
 37 * Similar to drmm_add_action(), with the only difference that upon failure
 38 * @action is directly called for any cleanup work necessary on failures.
 39 */
 40#define drmm_add_action_or_reset(dev, action, data) \
 41	__drmm_add_action_or_reset(dev, action, data, #action)
 42
 43int __must_check __drmm_add_action_or_reset(struct drm_device *dev,
 44					    drmres_release_t action,
 45					    void *data, const char *name);
 46
 47void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp) __malloc;
 48
 49/**
 50 * drmm_kzalloc - &drm_device managed kzalloc()
 51 * @dev: DRM device
 52 * @size: size of the memory allocation
 53 * @gfp: GFP allocation flags
 54 *
 55 * This is a &drm_device managed version of kzalloc(). The allocated memory is
 56 * automatically freed on the final drm_dev_put(). Memory can also be freed
 57 * before the final drm_dev_put() by calling drmm_kfree().
 58 */
 59static inline void *drmm_kzalloc(struct drm_device *dev, size_t size, gfp_t gfp)
 60{
 61	return drmm_kmalloc(dev, size, gfp | __GFP_ZERO);
 62}
 63
 64/**
 65 * drmm_kmalloc_array - &drm_device managed kmalloc_array()
 66 * @dev: DRM device
 67 * @n: number of array elements to allocate
 68 * @size: size of array member
 69 * @flags: GFP allocation flags
 70 *
 71 * This is a &drm_device managed version of kmalloc_array(). The allocated
 72 * memory is automatically freed on the final drm_dev_put() and works exactly
 73 * like a memory allocation obtained by drmm_kmalloc().
 74 */
 75static inline void *drmm_kmalloc_array(struct drm_device *dev,
 76				       size_t n, size_t size, gfp_t flags)
 77{
 78	size_t bytes;
 79
 80	if (unlikely(check_mul_overflow(n, size, &bytes)))
 81		return NULL;
 82
 83	return drmm_kmalloc(dev, bytes, flags);
 84}
 85
 86/**
 87 * drmm_kcalloc - &drm_device managed kcalloc()
 88 * @dev: DRM device
 89 * @n: number of array elements to allocate
 90 * @size: size of array member
 91 * @flags: GFP allocation flags
 92 *
 93 * This is a &drm_device managed version of kcalloc(). The allocated memory is
 94 * automatically freed on the final drm_dev_put() and works exactly like a
 95 * memory allocation obtained by drmm_kmalloc().
 96 */
 97static inline void *drmm_kcalloc(struct drm_device *dev,
 98				 size_t n, size_t size, gfp_t flags)
 99{
100	return drmm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
101}
102
103char *drmm_kstrdup(struct drm_device *dev, const char *s, gfp_t gfp);
104
105void drmm_kfree(struct drm_device *dev, void *data);
106
107#endif